Complete cross compilation tweaks.

tasks/native.rake

@@ -4,10 +4,16 @@ require 'rake/extensiontask'
 # build http11 C extension
 Rake::ExtensionTask.new('http11', HOE.spec) do |ext|
   # define target for extension (supporting fat binaries)
-  if RUBY_PLATFORM =~ /mingw/ then
+  if RUBY_PLATFORM =~ /mingw|mswin/ then
     RUBY_VERSION =~ /(\d+\.\d+)/
     ext.lib_dir = "lib/#{$1}"
   end
+
+  # define cross-compilation tasks when not on Windows.
+  unless RUBY_PLATFORM =~ /mingw|mswin/ then
+    ext.cross_compile = true
+    ext.cross_platform = ['i386-mswin32', 'i386-mingw32']
+  end
 end
 
 # ensure things are built prior testing